Mattress



FIG. 1 is a top plan view of a mattress in accordance with my new design, with an assemblage of six of the tubes shown in detail for clarity;

FIG. 2 is a left elevational view thereof, the right side view being identical;

FIG. 3 is a front elevational view thereof, the rear elevational view being identical;

FIG. 4 is an enlarged top left perspective view of the assemblage of six tubes in accordance with FIG. 1; and,

FIG. 5 is a left elevational view of the assemblage of FIG. 4, the right side elevational view being a mirror image. 

We claim the ornamental design for a mattress, as shown and described. 